Turbine.



W. J. A. LONDON! TURBINE.

APPLICATION FILED SEPT. 19, 1912.

Patented June 13, 1916.

[)VVENTOR. VVilZz'am (Ii-A. Lon don.

WITNESSES. AW A U m m T A THE COLUMBIA PLANOGEAPH co" WASHIN'GTDN. n. c.

WILLIAM J. A. LONDON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE TERRY STEAM TURBINE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TURBINE.

Application filed, September 19, 1912.

To all whom it may concern:

Be it known that 1, WILLIAM J. A. Low- DON, a subject of the King of England, residing in the city and county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Turbines, of which the following is a specification.

The object of the invention is to produce a turbine having high and low pressure stages embodying features of novelty and advantage.

The drawing illustrates a turbine made in accordance with my invention in central vertical section.

(1. denotes the casing and b the shaft passing through the casing and carrying the rotor elements, 0 c the bearings for the shaft and (Z (Z the packing glands where the shaft passes through the end walls of the casing.

1 denotes the high pressure stage of the turbine and is preferably of the Terry type having buckets in the periphery of the rotor and sets of reversing chambers. The details of this construction are not shown as the general mode of operation is well understood.

2 denotes the steam chamber and 3 the jet nozzle in which the steam is expanded down to atmospheric pressure.

The low pressure stage of the turbine comprises a parallel-flow impulse-type in which the steam is expanded from atmospheric pressure down to a vacuum of 29 inches for instance and the elements of this turbine are so arranged that the steam from the high pressure stage is conducted through a passage 6 to the outer end of the casing and is there expanded through this parallel-flow turbine to the center of the casing and to the exhaust 12. The high pressure stage is insulated from the low pressure stage by suitable means and preferably by a chamber 14 closed at one side by a diaphragm 15, which chamber may constitute a dead air space which is an effective heat insulator, or it may be packed with asbestos or some similar material. This prevents the absorption of heat by the low pressure stage from the high pressure stage and so prevents any decrease in efficiency. The packing gland between this insulating chamber and the shaft Specification of Letters Patent.

Patented June 13, 1916.

Serial No. 721,127.

b is automatically sealed by the steam in the high pressure stage and if there is any leak through this gland it is of steam which when it enters the exhaust will quickly expand to meet the condition which it finds there and so not decrease the efficiency of the low pressure stage to any material degree. It is also obvious that the glands at the end of the casing are balanced by atmospheric pressure Within and without the casing preventing any leakage at these points.

This construction of turbine provides an extremely compact and well balanced arrangement and avoids all duplication of parts and produces a highly eflicient mechanism especially when it is remembered that all of the glands are balanced and that the central gland is packed by the high pressure steam so as to prevent any ingress of atmospheric air which would impair efliciency.

I claim as my invention:

1. In a plural stage turbine, a casing and a shaft extending there-through, a heat insulating partition arranged transversally within the casing and dividing it into compartments, packing glands surrounding said shaft where it passes through said casing and partition, a peripheral impact rotor for the high-pressure stage mounted on a shaft in one of said compartments, a parallel flow impulse turbine located in the other compartment with its exhaust end adjacent to said partition; a steam conducting passage from the high pressure stage to the outer end of the low pressure stage.

2. In a plural stage turbine a casing, a chambered partition located within and extending transversally thereof to divide the floplea of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

